refactor: Simplify model version existence checks and enhance version retrieval methods in scanners

py/services/model_scanner.py

@@ -1362,3 +1362,59 @@ class ModelScanner:
         if file_name in self._hash_index._duplicate_filenames:
             if len(self._hash_index._duplicate_filenames[file_name]) <= 1:
                 del self._hash_index._duplicate_filenames[file_name]
+
+    async def check_model_version_exists(self, model_id: int, model_version_id: int) -> bool:
+        """Check if a specific model version exists in the cache
+        
+        Args:
+            model_id: Civitai model ID
+            model_version_id: Civitai model version ID
+            
+        Returns:
+            bool: True if the model version exists, False otherwise
+        """
+        try:
+            cache = await self.get_cached_data()
+            if not cache or not cache.raw_data:
+                return False
+                
+            for item in cache.raw_data:
+                if (item.get('civitai') and 
+                    item['civitai'].get('modelId') == model_id and 
+                    item['civitai'].get('id') == model_version_id):
+                    return True
+                    
+            return False
+        except Exception as e:
+            logger.error(f"Error checking model version existence: {e}")
+            return False
+
+    async def get_model_versions_by_id(self, model_id: int) -> List[Dict]:
+        """Get all versions of a model by its ID
+        
+        Args:
+            model_id: Civitai model ID
+            
+        Returns:
+            List[Dict]: List of version information dictionaries
+        """
+        try:
+            cache = await self.get_cached_data()
+            if not cache or not cache.raw_data:
+                return []
+                
+            versions = []
+            for item in cache.raw_data:
+                if (item.get('civitai') and 
+                    item['civitai'].get('modelId') == model_id and 
+                    item['civitai'].get('id')):
+                    versions.append({
+                        'versionId': item['civitai'].get('id'),
+                        'name': item['civitai'].get('name'),
+                        'fileName': item.get('file_name', '')
+                    })
+                    
+            return versions
+        except Exception as e:
+            logger.error(f"Error getting model versions: {e}")
+            return []